C / C++ / MFC

CWnd::OnInitMenuPopup(pPopupMenu, nIndex, bSysMenu);

ASSERT(pPopupMenu != NULL);
CCmdUI state; // Check the enabled state of various menu items
state.m_pMenu = pPopupMenu;
ASSERT(state.m_pOther == NULL);
ASSERT(state.m_pParentMenu == NULL);

// Is the menu in question a popup in the top-level menu? If so, set m_pOther
// to this menu. Note that m_pParentMenu == NULL indicates that the menu is a
// secondary popup.

HMENU hParentMenu;
if(AfxGetThreadState()->m_hTrackingMenu == pPopupMenu->m_hMenu)
    state.m_pParentMenu = pPopupMenu; // Parent == child for tracking popup.
else if((hParentMenu = ::GetMenu(m_hWnd)) != NULL)
{
    CWnd* pParent = this;
    // Child windows don't have menus--need to go to the top!
    if(pParent != NULL && (hParentMenu = ::GetMenu(pParent->m_hWnd)) != NULL)
    {
        int nIndexMax = ::GetMenuItemCount(hParentMenu);
        for (int nIndex = 0; nIndex < nIndexMax; nIndex++)
        {
            if(::GetSubMenu(hParentMenu, nIndex) == pPopupMenu->m_hMenu)
            {
                // When popup is found, m_pParentMenu is containing menu.
                state.m_pParentMenu = CMenu::FromHandle(hParentMenu);
                break;
            }
        }
    }
}

state.m_nIndexMax = pPopupMenu->GetMenuItemCount();
for(state.m_nIndex = 0; state.m_nIndex < state.m_nIndexMax; state.m_nIndex++)
{
    state.m_nID = pPopupMenu->GetMenuItemID(state.m_nIndex);
    if(state.m_nID == 0)
        continue; // Menu separator or invalid cmd - ignore it.
    ASSERT(state.m_pOther == NULL);
    ASSERT(state.m_pMenu != NULL);
    if(state.m_nID == (UINT)-1)
    {
        // Possibly a popup menu, route to first item of that popup.
        state.m_pSubMenu = pPopupMenu->GetSubMenu(state.m_nIndex);
        if(state.m_pSubMenu == NULL ||
            (state.m_nID = state.m_pSubMenu->GetMenuItemID(0)) == 0 ||
            state.m_nID == (UINT)-1)
        {
            continue; // First item of popup can't be routed to.
        }
        state.DoUpdate(this, TRUE); // Popups are never auto disabled.
    }
    else
    {
        // Normal menu item.
        // Auto enable/disable if frame window has m_bAutoMenuEnable
        // set and command is _not_ a system command.
        state.m_pSubMenu = NULL;
        state.DoUpdate(this, FALSE);
    }

    // Adjust for menu deletions and additions.
    UINT nCount = pPopupMenu->GetMenuItemCount();
    if(nCount < state.m_nIndexMax)
    {
        state.m_nIndex -= (state.m_nIndexMax - nCount);
        while(state.m_nIndex < nCount &&
            pPopupMenu->GetMenuItemID(state.m_nIndex) == state.m_nID)
        {
            state.m_nIndex++;
        }
    }
    state.m_nIndexMax = nCount;
}

// add to dialog class' message map
ON_MESSAGE(WM_KICKIDLE,&CMyDlg::OnKickIdle)

...

LRESULT CMyDlg::OnKickIdle(WPARAM wp, LPARAM lp)
{
	UpdateDialogControls(this, TRUE);

	return 0;
}

Mark Salsbery
Microsoft MVP - Visual C++